between those two support egyptian president morsi and those who want him to go. both sides using fire bombs, rocks, even sticks as weapons. and more than 120 people were wounded. >>> and now, we move onto the other big headline. the millimeters of americans battling breast cancer, getting this news. a new study saying a popular drug used to keep the disease from coming back should be taken twice as long for even better results. and the news has a lot of doctors saying they're going to change how they treat some of their patients. and abc's chief medical editor dr. richard besser here to tell us about it. we know about this drug, but a chase change in the way you use it. >> reporter: that's right. this is really big news for hundreds of thousands of women who have breast cancer that is hormone receptor positive. the study looked at the drug, which is a hormone blocker. they gave some women this drug for five years and some women this drug for ten years and then followed them for a ten-year period. women on the drug for five years, 25% of them had a recurrence. ten